using System; namespace ConsoleApp1
{
class Program{
static void Main(string[] args){
B b = new B();
}
}
class A{
public A(){
Console.WriteLine("基类的构造函数初始化!");
} }
class B:A{
public B(){
Console.WriteLine("派生类构造函数初始化!");
}
}
}
输出:
分析:
1.先根据层次链找到最顶层的基类,先调用基类构造函数,再依次调用各级派生类构造函数,
2.派生类会隐式地调用父类构造函数
显示调用父类构造函数:
using System; namespace ConsoleApp1
{
class Program{
static void Main(string[] args){
B b = new B();
}
}
class A{
public A(){
Console.WriteLine("基类的构造函数初始化!");
} }
class B:A{
public B():base(){
Console.WriteLine("派生类构造函数初始化!");
}
}
}
析构函数则与构造函数相反
派生类没有构造函数则隐式调用基类无参构造函数:
using System; namespace ConsoleApp1
{
class Program{
static void Main(string[] args){
B b = new B();
Console.WriteLine(b.getNum());
}
}
class A{
public int a{get;set;}
public A(){
Console.WriteLine("基类的构造函数初始化!");
this.a=;
} }
class B:A{
//public B(){
// Console.WriteLine("派生类构造函数初始化!");
//}
public int getNum(){
return this.a;
}
}
}